[FieldTrip] TFR with mtmconvol

[Jonathan Schubert]

Dear all,

I have a question regarding frequency analysis using the multitaper
approach. I transformed my data using the following code:

        cfg = [];
        cfg.channel    = 'all';
        cfg.output     = 'pow';
        cfg.method     = 'mtmconvol';
        cfg.foi        = 40:1:100;
        cfg.toi        = -1.0:0.02:1.0;
        cfg.t_ftimwin  = 7./cfg.foi;
        cfg.tapsmofrq  = cfg.foi*0.4;
        cfg.pad        = 'maxperlen';
        cfg.keeptrials = 'no';
        freq      = ft_freqanalysis(cfg, data);

When I plot the TFR it looks strange in a similiar way to what I found on
the fieldtrip homepage:
http://fieldtrip.fcdonders.nl/faq/why_does_my_tfr_look_strange
Following the help on the homepage did not improve the outcome. I attached
an example of my TFR.

What can I do to improve the outcome of the frequency analysis?

Best,
Jonathan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20121019/5177214d/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: sample_pic.jpg
Type: image/jpeg
Size: 38461 bytes
Desc: not available
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20121019/5177214d/attachment.jpg>